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How to fix this?

Discussion in 'Off Topic' started by Peter Krska, Mar 10, 2014.

  1. Peter Krska

    Peter Krska Active Member

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    I've been printing OK, but sometimes the prints have some cruddy mess on them.

    Is this due to being to low on the z axis or is it due to another reason?

    See pic
    [​IMG]

    [​IMG]

    [​IMG]

    iPhone case

    If you look at the top the guitars headstock is crummy.

    I use the abs/PLA version. Using Black PLA
    I heat to 200, 190 after that
    Bed heated to 55

    Electric vinyl tape. Hair spray: redken for men (hold still)




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    #1 Peter Krska, Mar 10, 2014
  2. Peter Krska

    Peter Krska Active Member

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    Anyone got an idea how to get a cleaner print?


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    #2 Peter Krska, Mar 11, 2014
  3. Ziggy

    Ziggy Moderator
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    When I have seen a problem like that it has been because the print has become partly unstuck (sometimes a little warped) and lifted very slightly off the bed.

    Once the nozzle hits a slightly raised print (even just a few tenths of a mm) it digs in and creates a mess.
     
    #3 Ziggy, Mar 11, 2014
  4. Peter Krska

    Peter Krska Active Member

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    Could the hot end be too low causing the lifting?


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    #4 Peter Krska, Mar 11, 2014
  5. Ziggy

    Ziggy Moderator
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    Doesn't look like the hot end was too low. If it were, you would probably see blobs of plastic all over the print where too much plastic had been extruded for the height and had squeezed out from around the nozzle area.

    Are you having similar problems with smaller prints?
     
    #5 Ziggy, Mar 11, 2014
  6. Peter Krska

    Peter Krska Active Member

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    I am having issues with getting the PLA to stick properly onto the glass bed. I got success when using vinyl tape. But small details I noticed got bunched up crud. Sometimes this crud or blobs stick to the print head and then gets moved ruining the print.

    Haven't tried a large print yet!


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    #6 Peter Krska, Mar 13, 2014
  7. Ziggy

    Ziggy Moderator
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    I know everyone has their favourite PLA sticking recipe but try this...

    Make a watery solution of PVA wood glue (like Aquadhere) - about 20% glue by volume, rest water. Paint it onto a separate glass sheet which can be fastened onto the Robo bed (with bulldog clips). Warm up the bed so the water evaporates and leaves a misty film of PVA glue on the glass.

    PLA sticks to this PVA film absolutely rock solid especially if you use a brim and warm the bed to about 50-60c during the print. In fact it sticks almost too well because the best way (sometimes the only way!!) to get the part off is to rinse the glass sheet and part under water then put the glass sheet/part in the freezer. 10-15 mins later and the part just slides off the glass. PVA residue cleans off the glass with water.

    This technique is not my invention. Many forums recommend this for PLA.
     
    #7 Ziggy, Mar 14, 2014
  8. CAMBO3D

    CAMBO3D New Member

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    if you want finer detail switch to a smaller nozzle, and go to a higher resolution print.. Theres only so much detail you can get out out .4 nozzle.
     
    #8 CAMBO3D, Mar 14, 2014
  9. Sean Maxwell

    Sean Maxwell New Member

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    on a side note, did you ever fix this and how long does it take to print?
     
    #9 Sean Maxwell, Mar 18, 2014
  10. Peter Krska

    Peter Krska Active Member

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    I am getting some improvement depending on the model. I also been creating my own models to see if they are an improvement. Stay tuned.


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    #10 Peter Krska, Mar 18, 2014

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